Costain Group PLC
27 July 2026
Investor Presentation via Investor Meet Company
Half Year 2026 Results Investor Q&A

Costain Group PLC ("Costain") announces that Alex Vaughan, CEO, and Helen Willis, CFO, will be hosting an investor Q&A session relating to the 2026 Half Year Results via Investor Meet Company on 17 August 2026 at 10.00am.
The Q&A session is open to all existing and potential shareholders. Questions can be submitted pre-event via the Investor Meet Company dashboard up until 10:00am the day before the meeting or at any time during the live presentation.
Investors can sign up to Investor Meet Company for free and add to meet Costain via:
https://www.investormeetcompany.com/costain-group-plc/register-investor
Investors who already follow Costain on the Investor Meet Company platform will automatically be invited.
Costain will issue its results for the half year 2026 on 13 August 2026.
Enquiries

|
Investors and analysts Matt Jones, Costain |
matt.jones@costain.com +44 (0) 7860 922341
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Financial media - Headland |
costain@headlandconsultancy.com |
|
Andy Rivett-Carnac |
+44 (0) 7968 997 365 |
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Charlie Twigg |
+44 (0) 7946 494 568 |
Notes to editors

Costain improves people's lives by creating connected, sustainable infrastructure that enables people and the planet to thrive. Through the delivery of predictable, best-in-class solutions across the transport, water, energy and defence markets, we are creating a sustainable future and securing a more prosperous, resilient and decarbonised UK.